Her Tuesday night “Bangerz” tour concert at the Sprint Center in Kansas City, Missouri, has been canceled, according to a statement from the arena.

“Cyrus has been hospitalized for a severe allergic reaction to antibiotics and has been placed on medical rest by her doctors,” the statement said. “She will not be able to perform as scheduled.”

The 21-year-old singer was not too ill to tweet from her Kansas City hospital bed, though.

“Kansas I promise Im as (heartbroken) as you are. I wanted so badly 2 b there 2night. Not being with yall makes me feel s–ttier than I already do,” she wrote in a Twitter message to fans Tuesday afternoon.

“Mr. Octopussy & some amazing Drs are taking good care of me,” Cyrus wrote in tweet that included a photo of her in a hospital bed wearing a gown. She was holding a green octopus toy in front of her face.

Cyrus fell ill with the flu earlier this month, causing the cancellation of a concert in Charlotte, North Carolina.

(editor’s note – Cyrus tweeted Wednesday, April 16 that she remained hospitalized and would also not make her scheduled St. Louis concert that night.)